Guangfei Qu

SO2 Absorption/Desorption Characteristics of Two Novel Phosphate Ionic Liquids

Two kinds of phosphate ionic liquids were synthesized and their SO2 absorption performance was investigated. It was found that both ionic liquids could readily absorb SO2, and the absorption capacity could reach 2.8 and 2.7 mol SO2 per mole ILs, respectively, at ambient temperature and under normal pressure. Moreover, the cycle of SO2 absorption and desorption from ionic liquids was repeated for four times and no change in the absorption capacity was observed. FT-IR spectrum and 1H NMR were used to characterize the microstructure of SO2-absorbed ILs and ILs, analysis showed that both ionic liquids absorbed SO2 purely by physical absorption. Comparing with the previous reported ionic liquids such as [Bmim][PF6] and [Emim][BF4], the synthesized ionic liquids showed higher absorption capacity, due to the anion based phosphate (O˭P‒O) with the free electrons on the oxygen interacting with the Lewis acidic sulfur of SO2, and then showing a great affinity for SO2.

Treatment of coking wastewater by a novel electric assisted micro-electrolysis filter

A newly designed electric assisted micro-electrolysis filter (E-ME) was developed to investigate its degradation efficiency for coking wastewater and correlated characteristics. The performance of the E-ME system was compared with separate electrolysis (SE) and micro-electrolysis (ME) systems. The results showed a prominent synergistic effect on COD removal in E-ME systems. Gas chromatography/mass spectrometry (GC-MS) analysis confirmed that the applied electric field enhanced the degradation of phenolic compounds. Meanwhile, more biodegradable oxygen-bearing compounds were detected. SEM images of granular activated carbon (GAC) showed that inactivation and blocking were inhibited during the E-ME process. The effects of applied voltage and initial pH in E-ME systems were also studied. The best voltage value was 1V, but synergistic effects existed even with lower applied voltage. E-ME systems exhibited some pH buffering capacity and attained the best efficiency in neutral media, which means that there is no need to adjust pH prior to or during the treatment process. Therefore, E-ME systems were confirmed as a promising technology for treatment of coking wastewater and other refractory wastewater.

Stabilization of arsenic in waste slag using FeCl2 or FeCl3 stabilizer

With the aim of stabilizing arsenic pollution in mine tailing, FeCl2 and FeCl3 were chosen as stabilizers. The changes in pH, speciation, and leaching concentration of arsenic were analyzed. The stabilization mechanism of the FeCl2 and FeCl3 stabilizers towards the removal of arsenic has been discussed based on FTIR spectroscopy and XRD results; the results show that both the FeCl2 and FeCl3 stabilizers can reduce the pH of arsenic waste slag, but pose the risk of acidification, especially for FeCl3. Both stabilizers could reduce the content of acid-soluble arsenic. When the Fe : As molar ratio was 1.0 and an FeCl2 mixed solution at pH = 7 and FeCl3 mixed solution at pH = 4 and pH = 7 were used, the acid-soluble arsenic was decreased by 96.22%, 93.42%, and 96.22%, respectively. The arsenic leaching concentration <2.5 mg L−1, which meets the minimum requirements for the entrance of safe landfill sites, demonstrates that the FeCl2 and FeCl3 stabilizers have good stabilizing effects. The acid-soluble arsenic or reducible arsenic can be converted into residual arsenic by the FeCl2 stabilizer. Furthermore, acid-soluble arsenic was converted into residual arsenic and oxidized arsenic by the FeCl3 stabilizer.

Study on rapid bio-drying technology of cow dung with CaO2

Effect of CaO2 on cow dung rapid bio-drying technology was researched. A static aerobic composting system was applied to this experiment which combining natural ventilation with Turing in the process of composting. The physical characteristics of cow dung was observed and the compost temperature, moisture content, organic matter, total nitrogen, total phosphorus, potassium content was determined which in order to study the effect of CaO2 on rapid drying of cattle in the compost. In the initial stage of compost, adding CaO2 groups compared with the control group, the temperature rise faster, 4-6 days in advance to the thermophilic phase; at the end of composting, the CaO2 composition and moisture content decreased significantly to below 30%. The addition of CaO2 in fertilizer was shorten the composting time, extend the thermophilic phase, to provide sufficient oxygen meeting the growth needs of aerobic microorganisms. It convinced that the rapid bio-drying of dairy manure has a good effect and provided a new idea for the effective treatment of cow dung.

Characterization of the Stabilization of Arsenic in Mine Tailings

ABSTRACT Ferrous chloride has been evaluated as a novel approach to stabilize arsenic in mine tailings. The influence of iron/arsenic molar ratio, pH, stabilization time, granularity, and temperature on the concentration of released arsenic was evaluated. Arsenic speciation before and after stabilization was characterized. When the iron/arsenic molar ratio was 1 and the pH was between 6.5 and 7.5 below 50°C using a stabilization time of 1 h, the concentration of released arsenic was below 2.5 mg/L which meets national Chinese standards. Hence, this approach enhanced the stability of arsenic and reduced the toxicity of mining by-products.

Research on New Method for Mapping Terrain and Landscape of Complex Environment

Engineering survey often encountered some special complex terrain, for example, large-scale reservoirs, lakes, marshes and wetlands, and so on. Conventional measuring methods cannot accurately detect the data of these environments, because of their special terrain, and difficult to piling, to set up measurement instruments. This paper presents a new methodology formapping terrain and landscape of complex environment. And the mapping process of Heshun town wetland terrain by using this new and simple measuring method was introduced. This new measuring method could be useful for non-professionals to map the terrain and landscape of complex environment.

Research on New Method of Mapping Highland Lake Isobath and Horizontal Surface Distance

Conventional measuring methods cannot accurately detect the depth and the horizontal distance of the lakes, especially when a fixed-point sampling is needed on the surface of the lake, because it is restricted by the natural conditions, capital and human resource. This paper presents a new methodology for measuring the isobath and the horizontal surface distance of a lake. And the mapping process of 8m isobath Yangzonghai Lake near Quan-Yong Point by using this new and simple measuring method was introduced. This new measuring method could be useful for non-professionals to map the isobath lines and to measure the horizontal surface distance of lakes.